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Metric Threads are the globally recognized thread standard for machined parts, hydraulic systems, fittings, and pressure connections, especially in European and Asian industries. At Perfect Engineers, we manufacture and supply metric-threaded Ball Valves, Fittings, and Adapters that seamlessly integrate into ISO-based piping and mechanical systems, delivering precision fitment, leak-free performance, and international compatibility.
A Metric Thread is a standardized screw thread based on the International System of Units (SI) and governed by ISO 261 and ISO 965 standards. It features:
Metric threads are commonly used in hydraulic fittings, valves, pressure connections, and instrumentation lines.
| Feature | Metric Thread (ISO Standard) |
| Thread Type | Parallel (DIN 13 / ISO 261) |
| Thread Angle | 60° |
| Designation Example | M20 × 1.5 (M = Metric, 20mm OD, 1.5mm pitch) |
| Sealing Style | Metal-to-metal / O-ring face / Bonded washer |
| Common Standards | DIN 3852, ISO 6149, ISO 9974 |
| Application Range | M6 to M100+ |
| Feature | Metric Thread | BSP Thread | NPT Thread |
| Thread Type | Parallel | Parallel/Tapered | Tapered |
| Thread Angle | 60° | 55° | 60° |
| Size Units | Millimeters (mm) | Inches (e.g., ½”, ¾”) | Inches |
| Seal Type | O-ring or bonded washer | Taper or washer | Thread sealant (PTFE) |
| Common In | EU, Asia, Global OEMs | India, UK, Asia | U.S., Canada, Mexico |
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No. Metric threads differ in angle, pitch, and sizing. Use converters or adaptors if needed.
Most seal via O-ring face or bonded washer, ensuring a leak-tight, vibration-resistant joint.
Yes—especially DIN 3852 and ISO 6149 valves, built for hydraulic and pneumatic systems.
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